This standard is applicable to electrical equipment protected by enclosure and surface temperature limitation for use in explosive dust atmospheres. It specifies requirements for design@ construction and testing of electrical equipment. This standard supplements and modifies the general requirements of ANSI/ISA 60079-0. Where a requirement of this standard conflicts with a requirement of ANSI/ISA 60079-0@ the requirement of this standard shall take precedence. This standard does not apply to dusts of explosives@ which do not require atmospheric oxygen for combustion@ or to pyrophoric substances. This standard does not apply to electrical equipment intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. This standard does not take account of any risk due to an emission of flammable or toxic gas from the dust. NOTE 1 The application of electrical equipment in atmospheres@ which may contain combustible dust as well as explosive gas@ whether simultaneously or separately@ may require additional protective measures. NOTE 2 Where the equipment has to meet other environmental conditions@ for example@ protection against ingress of water and resistance to corrosion@ additional methods of protection may be necessary. The method used should not adversely affect the integrity of the enclosure.